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Darcy-Weisbach Head Loss Calculator

Frictional head loss in a pipe.

Compute the head loss due to friction in a pipe using the Darcy-Weisbach equation h_f = f · (L/D) · v² / (2g), given the friction factor, pipe length and diameter, and the mean flow velocity.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

m
m
m/s

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

h_f = f · (L/D) · v² / (2g), g = 9.81 m/s².

In depth

Compute the head loss due to friction in a pipe using the Darcy-Weisbach equation h_f = f · (L/D) · v² / (2g), given the friction factor, pipe length and diameter, and the mean flow velocity.